Heavy-metal inhibition of nitrification in selected Iowa soils treated with Stay-N 2000

D. Rovita, R. Killorn

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Heavy-metal inhibition of nitrification in soils treated with reformulated nitrapyrin was investigated. Clarion and Okoboji soils were treated with ammonium sulfate [(NH4)2SO4] and a nitrification inhibitor. Copper(II) (Cu), Zinc(II) (Zn), Cadmium(II) (Cd), or Lead(II) (Pb) were added to each soil. A first-order equation was used to calculate the maximum nitrification rate (Kmax), duration of lag period (t′), period of maximum nitrification (Δt), and the termination period of nitrification (ts). In the Clarion soil, the Kmax decreased from 12 mg kg-1 d-1 without the nitrification inhibitor to 4, 0.25, 0.86, and 0.27 mg kg-1 d-1, respectively, when the inhibitor and Cu, Zn, Pb, or Cd were applied. In the Okoboji soil, Kmax decreased from 22 mg kg-1 d-1 with no inhibitor to 6, 3, 4, and 2 mg kg-1 d-1, respectively, when an inhibitor and Cu, Zn, Pb, or Cd were added. The t′ varied from 8 to 25 d in the Clarion soil and from 5 to 25 d in the Okoboji soil, due to addition of Cu, Zn, Pb, or Cd and the inhibitor.

Original languageEnglish
Pages (from-to)972-982
Number of pages11
JournalCommunications in Soil Science and Plant Analysis
Volume39
Issue number7-8
DOIs
Publication statusPublished - Apr 2008

Keywords

  • Heavy metals
  • Nitrification
  • Nitrification inhibitor

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